Hi Poul-Henning,
On Wed, 20 Apr 2011 17:26:15 +0200, Poul-Henning Kamp <[email protected]>
wrote:
In message <[email protected]>, paul
swed writ es:
...
As for mains stability. They are indeed stable over time weeks and
months
and are corrected.
...
Here in europe that was lost in the "privatization" of the grid: Nobody
was charged with paying for the extra power needed to capture lost
cycles, so now they just try to keep it close to 50.0Hz and don't
care about the integral.
where do you get that information? The ETSOE(transmission operators
network)-handbook
which specifies the control-loops for frequency/phase have a section on
TIME CONTROL.
They define different levels of allowed offsets between integrated network
phase and UTC.
There are three bands with allowed deviations of +/- 20, 30 and 60 seconds
(target, tolerated and exceptional).
https://www.entsoe.eu/resources/publications/entso-e/operation-handbook/
--- QUOTE from Section P1, Page 29 ---
D. Time Control
[UCTE Operation Handbook Appendix 1 Chapter D: Time Control, 2004] {update
under preparation}
Introduction
The objective of TIME CONTROL is to monitor and limit discrepancies
observed between
SYNCHRONOUS TIME and universal co-ordinated time (UTC) in the SYNCHRONOUS
AREA.
Reasonably it is applied during periods of uninterrupted interconnected
operation, where the
SYNCHRONOUS TIME is the same in all control areas.
...
A discrepancy between SYNCHRONOUS TIME and UTC is tolerated within a range
of ±20 seconds (without need for time control actions).
---/QUOTE---
Greetings from Germany,
Chris
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